Write the equation of the parabola in vertex from

Step-by-step explanation:

Notice that the vertex of the parabola is at (-1, 3), so we can start the expression of the quadratic in vertex form as:

we can now find the coefficient "a" by using another point the parabola goes through, like for example (0,2):

So the final expression for the parabola in vertex form is:

the equation for this situation is y=122+45. to solve the equation you would add 45 and 122 to get a total of 167lbs. in conclusion, grace's weight eight weeks ago was 167lbs.